cr044# systemctl status ModemManager              
??? ModemManager.service - Modem Manager
   Loaded: loaded (/lib/systemd/system/ModemManager.service; enabled; vendor preset: enabled)
   Active: active (running) since Fri 2017-05-19 11:04:15 PDT; 22min ago
 Main PID: 8368 (ModemManager)
   CGroup: /system.slice/ModemManager.service
           ??????8368 /usr/sbin/ModemManager
           ??????8374 /usr/lib/libqmi/qmi-proxy

May 19 11:25:18 cr044 ModemManager[8368]: <info>  Modem /org/freedesktop/ModemManager1/Modem/1: state changed (registered )
May 19 11:25:18 cr044 ModemManager[8368]: [/dev/cdc-wdm0] Allocating new client ID...
May 19 11:25:18 cr044 ModemManager[8368]: [/dev/cdc-wdm0] Registered 'wds' (version 1.36) client with ID '9'
May 19 11:25:21 cr044 ModemManager[8368]: [/dev/cdc-wdm0] Allocating new client ID...
May 19 11:25:21 cr044 ModemManager[8368]: [/dev/cdc-wdm0] Registered 'wds' (version 1.36) client with ID '10'
May 19 11:25:21 cr044 ModemManager[8368]: <info>  error: couldn't start network: QMI protocol error (14): 'CallFailed'
May 19 11:25:21 cr044 ModemManager[8368]: <info>  call end reason (1): 'generic-unspecified'
May 19 11:25:21 cr044 ModemManager[8368]: <info>  verbose call end reason (2,204): [internal] unknown-cause
May 19 11:25:21 cr044 ModemManager[8368]: <info>  Modem /org/freedesktop/ModemManager1/Modem/1: state changed (connecting )
May 19 11:25:21 cr044 ModemManager[8368]: <info>  Simple connect state (8/8): All done
cr044 [systemctl status ModemManager] ~